Arc flash is a dangerous condition that can occurred in industrial electrical systems. It could be caused by failure systems or because of wrong maintenance procedure. Arc flash could damage the equipment even death of the worker who where around it. Therefore protection against this is necessary to keep the equipment and the workers. In this final project will carried out studies on arc flash in Joint Operating Body PertaminaPetrochina East Java JOB P-PEJ Tuban. This study will calculate arc flash energy appropriate the standard and reduce incident energy with re-coordination and add protection device when needed. The result of this study indicated that the existing condition required re-coordination because of the incident energy was exceed of standard. After re-coordination setting applied decreased of incident energy was occured.

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